---
title: "CVE-2026-105639: Plane - Authentication Bypass & Broken Access Control"
description: "Plane < 1.4.0 contains an authentication bypass caused by lack of out-of-band email ownership verification in signup flow, letting unauthenticated attackers register as target users and join workspaces via invitation tokens, exploit requires attacker to register with target email."
url: https://panop.io/threat-heartbeat/CVE-2026-105639/
---

# CVE-2026-105639 Plane - Authentication Bypass & Broken Access Control

Plane < 1.4.0 contains an authentication bypass caused by lack of out-of-band email ownership verification in signup flow, letting unauthenticated attackers register as target users and join workspaces via invitation tokens, exploit requires attacker to register with target email.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.39% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-105639)

## Details

Type

Authentication Bypass

Impact

Broken Authentication, Broken Access Control

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

5 October 2026

Updated

15 October 2026

Weakness

[CWE-200](https://cwe.mitre.org/data/definitions/200.html)

## Vendor fix

Update to version 1.4.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-105639](https://nvd.nist.gov/vuln/detail/CVE-2026-105639)
- [https://github.com/makeplane/plane/commit/6220ba990b2276a1a1979d1d5df68f650b8b47ad](https://github.com/makeplane/plane/commit/6220ba990b2276a1a1979d1d5df68f650b8b47ad)
- [https://github.com/makeplane/plane/pull/9297](https://github.com/makeplane/plane/pull/9297)
- [https://github.com/makeplane/plane/releases/tag/v1.4.0](https://github.com/makeplane/plane/releases/tag/v1.4.0)
- [https://github.com/makeplane/plane/security/advisories/GHSA-4vj8-p63v-8p24](https://github.com/makeplane/plane/security/advisories/GHSA-4vj8-p63v-8p24)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)